Yiisoft\Db\Pgsql\Schema::findConstraints()

Complexity

Conditions	8
Paths	14

Size

Total Lines	511
Code Lines	478

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	170
CRAP Score	8

Importance

Changes	8
Bugs	0	Features	0

<?php
    protected function findConstraints(TableSchemaInterface $table): void

The parameter $table is not used and could be removed.

    {
        /**
         * We need to extract the constraints de hard way since:
         * {@see https://www.postgresql.org/message-id/26677.1086673982@sss.pgh.pa.us}
         */

        $sql = <<<SQL
        SELECT
            ct.conname as constraint_name,
            a.attname as column_name,
            fc.relname as foreign_table_name,
            fns.nspname as foreign_table_schema,
            fa.attname as foreign_column_name
            FROM
            (SELECT ct.conname, ct.conrelid, ct.confrelid, ct.conkey, ct.contype, ct.confkey,
                generate_subscripts(ct.conkey, 1) AS s
                FROM pg_constraint ct
            ) AS ct
            inner join pg_class c on c.oid=ct.conrelid
            inner join pg_namespace ns on c.relnamespace=ns.oid
            inner join pg_attribute a on a.attrelid=ct.conrelid and a.attnum = ct.conkey[ct.s]
            left join pg_class fc on fc.oid=ct.confrelid
            left join pg_namespace fns on fc.relnamespace=fns.oid
            left join pg_attribute fa on fa.attrelid=ct.confrelid and fa.attnum = ct.confkey[ct.s]
        WHERE
            ct.contype='f'
            and c.relname=:tableName
            and ns.nspname=:schemaName
        ORDER BY
            fns.nspname, fc.relname, a.attnum
        SQL;

        /** @psalm-var array{array{tableName: string, columns: array}} $constraints */
        $constraints = [];

        /** @psalm-var array<FindConstraintArray> $rows */
        $rows = $this->db->createCommand($sql, [
            ':schemaName' => $table->getSchemaName(),
            ':tableName' => $table->getName(),
        ])->queryAll();

        foreach ($rows as $constraint) {
            /** @psalm-var FindConstraintArray $constraint */
            $constraint = $this->normalizeRowKeyCase($constraint, false);

            if ($constraint['foreign_table_schema'] !== $this->defaultSchema) {
                $foreignTable = $constraint['foreign_table_schema'] . '.' . $constraint['foreign_table_name'];
            } else {
                $foreignTable = $constraint['foreign_table_name'];
            }

            $name = $constraint['constraint_name'];

            if (!isset($constraints[$name])) {
                $constraints[$name] = [
                    'tableName' => $foreignTable,
                    'columns' => [],
                ];
            }

            $constraints[$name]['columns'][$constraint['column_name']] = $constraint['foreign_column_name'];
        }

        /**
         * @psalm-var int|string $foreingKeyName.
         * @psalm-var array{tableName: string, columns: array} $constraint
         */
        foreach ($constraints as $foreingKeyName => $constraint) {
            $table->foreignKey(
                (string) $foreingKeyName,
                array_merge([$constraint['tableName']], $constraint['columns'])
            );
        }
    }

    /**
     * Gets information about given table unique indexes.
     *
     * @param TableSchemaInterface $table The table metadata.
     *
     * @throws Exception
     * @throws InvalidConfigException
     * @throws Throwable
     *
     * @return array With index and column names.
     */
    protected function getUniqueIndexInformation(TableSchemaInterface $table): array
    {
        $sql = <<<'SQL'
        SELECT
            i.relname as indexname,
            pg_get_indexdef(idx.indexrelid, k + 1, TRUE) AS columnname
        FROM (
            SELECT *, generate_subscripts(indkey, 1) AS k
            FROM pg_index
        ) idx
        INNER JOIN pg_class i ON i.oid = idx.indexrelid
        INNER JOIN pg_class c ON c.oid = idx.indrelid
        INNER JOIN pg_namespace ns ON c.relnamespace = ns.oid
        WHERE idx.indisprimary = FALSE AND idx.indisunique = TRUE
        AND c.relname = :tableName AND ns.nspname = :schemaName
        ORDER BY i.relname, k
        SQL;

        return $this->db->createCommand($sql, [
            ':schemaName' => $table->getSchemaName(),
            ':tableName' => $table->getName(),
        ])->queryAll();
    }

    /**
     * Returns all unique indexes for the given table.
     *
     * Each array element is of the following structure:
     *
     * ```php
     * [
     *     'IndexName1' => ['col1' [, ...]],
     *     'IndexName2' => ['col2' [, ...]],
     * ]
     * ```
     *
     * @param TableSchemaInterface $table The table metadata
     *
     * @throws Exception
     * @throws InvalidConfigException
     * @throws Throwable
     *
     * @return array All unique indexes for the given table.
     */
    public function findUniqueIndexes(TableSchemaInterface $table): array
    {
        $uniqueIndexes = [];

        /** @psalm-var array{indexname: string, columnname: string} $row */
        foreach ($this->getUniqueIndexInformation($table) as $row) {
            /** @psalm-var array{indexname: string, columnname: string} $row */
            $row = $this->normalizeRowKeyCase($row, false);

            $column = $row['columnname'];

            if (str_starts_with($column, '"') && str_ends_with($column, '"')) {
                /**
                 * postgres will quote names that aren't lowercase-only.
                 *
                 * {@see https://github.com/yiisoft/yii2/issues/10613}
                 */
                $column = substr($column, 1, -1);
            }

            $uniqueIndexes[$row['indexname']][] = $column;
        }

        return $uniqueIndexes;
    }

    /**
     * Collects the metadata of table columns.
     *
     * @param TableSchemaInterface $table The table metadata.
     *
     * @throws Exception
     * @throws InvalidConfigException
     * @throws JsonException
     * @throws Throwable
     *
     * @return bool Whether the table exists in the database.
     */
    protected function findColumns(TableSchemaInterface $table): bool
    {
        $orIdentity = '';

        if (version_compare($this->db->getServerVersion(), '12.0', '>=')) {
            $orIdentity = 'OR a.attidentity != \'\'';
        }

        $sql = <<<SQL
        SELECT
            d.nspname AS table_schema,
            c.relname AS table_name,
            a.attname AS column_name,
            COALESCE(td.typname, tb.typname, t.typname) AS data_type,
            COALESCE(td.typtype, tb.typtype, t.typtype) AS type_type,
            (SELECT nspname FROM pg_namespace WHERE oid = COALESCE(td.typnamespace, tb.typnamespace, t.typnamespace)) AS type_scheme,
            a.attlen AS character_maximum_length,
            pg_catalog.col_description(c.oid, a.attnum) AS column_comment,
            information_schema._pg_truetypmod(a, t) AS modifier,
            NOT (a.attnotnull OR t.typnotnull) AS is_nullable,
            COALESCE(t.typdefault, pg_get_expr(ad.adbin, ad.adrelid)) AS column_default,
            COALESCE(pg_get_expr(ad.adbin, ad.adrelid) ~ 'nextval', false) $orIdentity AS is_autoinc,
            pg_get_serial_sequence(quote_ident(d.nspname) || '.' || quote_ident(c.relname), a.attname)
            AS sequence_name,
            CASE WHEN COALESCE(td.typtype, tb.typtype, t.typtype) = 'e'::char
                THEN array_to_string(
                    (
                        SELECT array_agg(enumlabel)
                        FROM pg_enum
                        WHERE enumtypid = COALESCE(td.oid, tb.oid, a.atttypid)
                    )::varchar[],
                ',')
                ELSE NULL
            END AS enum_values,
            information_schema._pg_numeric_precision(
                COALESCE(td.oid, tb.oid, a.atttypid),
                information_schema._pg_truetypmod(a, t)
            ) AS numeric_precision,
            information_schema._pg_numeric_scale(
                COALESCE(td.oid, tb.oid, a.atttypid),
                information_schema._pg_truetypmod(a, t)
            ) AS numeric_scale,
            information_schema._pg_char_max_length(
                COALESCE(td.oid, tb.oid, a.atttypid),
                information_schema._pg_truetypmod(a, t)
            ) AS size,
            ct.oid IS NOT NULL AS is_pkey,
            COALESCE(NULLIF(a.attndims, 0), NULLIF(t.typndims, 0), (t.typcategory='A')::int) AS dimension
        FROM
            pg_class c
            LEFT JOIN pg_attribute a ON a.attrelid = c.oid
            LEFT JOIN pg_attrdef ad ON a.attrelid = ad.adrelid AND a.attnum = ad.adnum
            LEFT JOIN pg_type t ON a.atttypid = t.oid
            LEFT JOIN pg_type tb ON (a.attndims > 0 OR t.typcategory='A') AND t.typelem > 0 AND t.typelem = tb.oid
                                        OR t.typbasetype > 0 AND t.typbasetype = tb.oid
            LEFT JOIN pg_type td ON t.typndims > 0 AND t.typbasetype > 0 AND tb.typelem = td.oid
            LEFT JOIN pg_namespace d ON d.oid = c.relnamespace
            LEFT JOIN pg_rewrite rw ON c.relkind = 'v' AND rw.ev_class = c.oid AND rw.rulename = '_RETURN'
            LEFT JOIN pg_constraint ct ON ct.conrelid = c.oid AND ct.contype = 'p' AND a.attnum = ANY (ct.conkey)
                OR rw.ev_action IS NOT NULL AND ct.contype = 'p'
                AND (ARRAY(
                    SELECT regexp_matches(rw.ev_action, '{TARGETENTRY .*? :resorigtbl (\d+) :resorigcol (\d+) ', 'g')
                ))[a.attnum:a.attnum] <@ (ct.conrelid || ct.conkey)::text[]
        WHERE
            a.attnum > 0 AND t.typname != '' AND NOT a.attisdropped
            AND c.relname = :tableName
            AND d.nspname = :schemaName
        ORDER BY
            a.attnum;
        SQL;

        $columns = $this->db->createCommand($sql, [
            ':schemaName' => $table->getSchemaName(),
            ':tableName' => $table->getName(),
        ])->queryAll();

        if (empty($columns)) {
            return false;
        }

        /** @psalm-var ColumnArray $info */
        foreach ($columns as $info) {
            /** @psalm-var ColumnArray $info */
            $info = $this->normalizeRowKeyCase($info, false);

            /** @psalm-var ColumnSchema $column */
            $column = $this->loadColumnSchema($info);

            $table->column($column->getName(), $column);

            if ($column->isPrimaryKey()) {
                $table->primaryKey($column->getName());

                if ($table->getSequenceName() === null) {
                    $table->sequenceName($column->getSequenceName());
                }
            }
        }

        return true;
    }

    /**
     * Loads the column information into a {@see ColumnSchemaInterface} object.
     *
     * @psalm-param ColumnArray $info Column information.
     *
     * @return ColumnSchemaInterface The column schema object.
     */
    protected function loadColumnSchema(array $info): ColumnSchemaInterface
    {
        $column = $this->createColumnSchema($info['column_name']);
        $column->allowNull($info['is_nullable']);
        $column->autoIncrement($info['is_autoinc']);
        $column->comment($info['column_comment']);

        if (!in_array($info['type_scheme'], [$this->defaultSchema, 'pg_catalog'], true)) {
            $column->dbType($info['type_scheme'] . '.' . $info['data_type']);
        } else {
            $column->dbType($info['data_type']);
        }

        $column->enumValues($info['enum_values'] !== null
            ? explode(',', str_replace(["''"], ["'"], $info['enum_values']))
            : null);
        $column->unsigned(false); // has no meaning in PG
        $column->primaryKey((bool) $info['is_pkey']);
        $column->precision($info['numeric_precision']);
        $column->scale($info['numeric_scale']);
        $column->size($info['size'] === null ? null : (int) $info['size']);
        $column->dimension($info['dimension']);

        /**
         * pg_get_serial_sequence() doesn't track DEFAULT value change.
         * GENERATED BY IDENTITY columns always have a null default value.
         */
        $defaultValue = $info['column_default'];

        if (
            $defaultValue !== null
            && preg_match("/^nextval\('([^']+)/", $defaultValue, $matches) === 1
        ) {
            $column->sequenceName($matches[1]);
        } elseif ($info['sequence_name'] !== null) {
            $column->sequenceName($this->resolveTableName($info['sequence_name'])->getFullName());
        }

        $column->type($this->typeMap[(string) $column->getDbType()] ?? self::TYPE_STRING);
        $column->phpType($this->getColumnPhpType($column));
        $column->defaultValue($this->normalizeDefaultValue($defaultValue, $column));

        return $column;
    }

    /**
     * Extracts the PHP type from an abstract DB type.
     *
     * @param ColumnSchemaInterface $column The column schema information.
     *
     * @return string The PHP type name.
     */
    protected function getColumnPhpType(ColumnSchemaInterface $column): string
    {
        if ($column->getType() === self::TYPE_BIT) {
            return self::PHP_TYPE_INTEGER;
        }

        return parent::getColumnPhpType($column);
    }

    /**
     * Converts column's default value according to {@see ColumnSchema::phpType} after retrieval from the database.
     *
     * @param string|null $defaultValue The default value retrieved from the database.
     * @param ColumnSchemaInterface $column The column schema object.
     *
     * @return mixed The normalized default value.
     */
    private function normalizeDefaultValue(string|null $defaultValue, ColumnSchemaInterface $column): mixed
    {
        if (
            $defaultValue === null
            || $column->isPrimaryKey()
            || str_starts_with($defaultValue, 'NULL::')
        ) {
            return null;
        }

        if ($column->getType() === self::TYPE_BOOLEAN && in_array($defaultValue, ['true', 'false'], true)) {
            return $defaultValue === 'true';
        }

        if (
            in_array($column->getType(), [self::TYPE_TIMESTAMP, self::TYPE_DATE, self::TYPE_TIME], true)
            && in_array(strtoupper($defaultValue), ['NOW()', 'CURRENT_TIMESTAMP', 'CURRENT_DATE', 'CURRENT_TIME'], true)
        ) {
            return new Expression($defaultValue);
        }

        $value = preg_replace("/^B?['(](.*?)[)'](?:::[^:]+)?$/s", '$1', $defaultValue);
        $value = str_replace("''", "'", $value);

        if ($column->getType() === self::TYPE_BINARY && str_starts_with($value, '\\x')) {
            return hex2bin(substr($value, 2));
        }

        return $column->phpTypecast($value);
    }

    /**
     * Loads multiple types of constraints and returns the specified ones.
     *
     * @param string $tableName The table name.
     * @param string $returnType The return type:
     * - primaryKey
     * - foreignKeys
     * - uniques
     * - checks
     *
     * @throws Exception
     * @throws InvalidConfigException
     * @throws Throwable
     *
     * @return array|Constraint|null Constraints.
     *
     * @psalm-return CheckConstraint[]|Constraint[]|ForeignKeyConstraint[]|Constraint|null
     */
    private function loadTableConstraints(string $tableName, string $returnType): array|Constraint|null
    {
        $sql = <<<SQL
        SELECT
            "c"."conname" AS "name",
            "a"."attname" AS "column_name",
            "c"."contype" AS "type",
            "ftcns"."nspname" AS "foreign_table_schema",
            "ftc"."relname" AS "foreign_table_name",
            "fa"."attname" AS "foreign_column_name",
            "c"."confupdtype" AS "on_update",
            "c"."confdeltype" AS "on_delete",
            pg_get_constraintdef("c"."oid") AS "check_expr"
        FROM "pg_class" AS "tc"
        INNER JOIN "pg_namespace" AS "tcns"
            ON "tcns"."oid" = "tc"."relnamespace"
        INNER JOIN "pg_attribute" AS "a"
            ON "a"."attrelid" = "tc"."oid"
        LEFT JOIN pg_rewrite AS rw
            ON "tc"."relkind" = 'v' AND "rw"."ev_class" = "tc"."oid" AND "rw"."rulename" = '_RETURN'
        INNER JOIN "pg_constraint" AS "c"
            ON "c"."conrelid" = "tc"."oid" AND "a"."attnum" = ANY ("c"."conkey")
                OR "rw"."ev_action" IS NOT NULL AND "c"."conrelid" != 0
                AND (ARRAY(
                    SELECT regexp_matches("rw"."ev_action", '{TARGETENTRY .*? :resorigtbl (\d+) :resorigcol (\d+) ', 'g')
                ))["a"."attnum":"a"."attnum"] <@ ("c"."conrelid" || "c"."conkey")::text[]
        LEFT JOIN "pg_class" AS "ftc"
            ON "ftc"."oid" = "c"."confrelid"
        LEFT JOIN "pg_namespace" AS "ftcns"
            ON "ftcns"."oid" = "ftc"."relnamespace"
        LEFT JOIN "pg_attribute" "fa"
            ON "fa"."attrelid" = "c"."confrelid" AND "fa"."attnum" = ANY ("c"."confkey")
        WHERE "tcns"."nspname" = :schemaName AND "tc"."relname" = :tableName
        ORDER BY "a"."attnum" ASC, "fa"."attnum" ASC
        SQL;

        /** @psalm-var string[] $actionTypes */
        $actionTypes = [
            'a' => 'NO ACTION',
            'r' => 'RESTRICT',
            'c' => 'CASCADE',
            'n' => 'SET NULL',
            'd' => 'SET DEFAULT',
        ];

        $resolvedName = $this->resolveTableName($tableName);

The variable $tableName does not exist. Did you maybe mean $table?

        $constraints = $this->db->createCommand($sql, [
            ':schemaName' => $resolvedName->getSchemaName(),
            ':tableName' => $resolvedName->getName(),
        ])->queryAll();

        /** @psalm-var array[][] $constraints */
        $constraints = $this->normalizeRowKeyCase($constraints, true);
        $constraints = DbArrayHelper::index($constraints, null, ['type', 'name']);

        $result = [
            self::PRIMARY_KEY => null,
            self::FOREIGN_KEYS => [],
            self::UNIQUES => [],
            self::CHECKS => [],
        ];

        /**
         * @psalm-var string $type
         * @psalm-var array $names
         */
        foreach ($constraints as $type => $names) {
            /**
             * @psalm-var object|string|null $name
             * @psalm-var ConstraintArray $constraint
             */
            foreach ($names as $name => $constraint) {
                switch ($type) {
                    case 'p':
                        $result[self::PRIMARY_KEY] = (new Constraint())
                            ->name($name)
                            ->columnNames(DbArrayHelper::getColumn($constraint, 'column_name'));
                        break;
                    case 'f':
                        $onDelete = $actionTypes[$constraint[0]['on_delete']] ?? null;
                        $onUpdate = $actionTypes[$constraint[0]['on_update']] ?? null;

                        $result[self::FOREIGN_KEYS][] = (new ForeignKeyConstraint())
                            ->name($name)
                            ->columnNames(array_values(
                                array_unique(DbArrayHelper::getColumn($constraint, 'column_name'))
                            ))
                            ->foreignSchemaName($constraint[0]['foreign_table_schema'])
                            ->foreignTableName($constraint[0]['foreign_table_name'])
                            ->foreignColumnNames(array_values(
                                array_unique(DbArrayHelper::getColumn($constraint, 'foreign_column_name'))
                            ))
                            ->onDelete($onDelete)
                            ->onUpdate($onUpdate);
                        break;
                    case 'u':
                        $result[self::UNIQUES][] = (new Constraint())
                            ->name($name)
                            ->columnNames(DbArrayHelper::getColumn($constraint, 'column_name'));
                        break;
                    case 'c':
                        $result[self::CHECKS][] = (new CheckConstraint())
                            ->name($name)
                            ->columnNames(DbArrayHelper::getColumn($constraint, 'column_name'))
                            ->expression($constraint[0]['check_expr']);
                        break;
                }
            }
        }

        foreach ($result as $type => $data) {
            $this->setTableMetadata($tableName, $type, $data);
        }

        return $result[$returnType];

The expression return $result[$returnType] could return the type array which is incompatible with the type-hinted return void. Consider adding an additional type-check to rule them out.

The variable $returnType seems to be never defined.

    }